PARTULA OTAHEITANA. I9I 
mens of Tuauru, those of Ahonu display a distinct median stripe, and usually an ill- 
defined basal marking. The plain shells (plate 28, figs. 43 to 45) are far less strigated 
and hence much more even in coloration, while their tints are richer than before; 
in one specimen (fig. 45) a rose-brown spine occurs. The statistics as given in 
table 123 show that the members of this colony are smaller on the whole than in 
Tuauru. ‘The figures for the banded dextral and the plain reversed shells must not 
be given too much weight, in view of the small numbers concerned, but in the case of 
the first-named class it is clear that the departures from the conditions of the more 
abundant plain stock are not in the directions taken by the banded group in Tuauru. 
TasBLe 121.—Partula otaheitana affinis. Tuauru Valley. Fecundity. 
Series! Records! No. of Per cent No. of | No. of Total Average Average 
gravid.| gravid. eggs. | young. | contents. | for gravid. for all. 
Dextral, plain, light... 77 63 81.8 34 74 108 ot 1.4 
dark... 189 153 80.9 103 178 281 1.8 ib.&) 
Dextral, plain........ 266 216 81.2 137 252 389 1.8 1.5 
banded...... 76 54 71.0 49 58 107 1.9 1.4 
DMextral pallies asc 342 270 78.9 186 310 496 1.8 1.4 
TaBLe 122.—Partula otaheitana affinis, Tuauru Valley. Heredity. 
Young, plain. Summary. 
Young,| Young, 
Light. plain libandeds 
Dark. 
Adults: 
Plain { : 
Banded 
TasLe 123.—Partula otaheitana affinis. Ahonu Valley. 
Mean VALUE. 
Aperture. Length aper- 
) Shell. 
Series. No. 
Length. Width. Proportions. Width. 
mm. 
6.9328 + .0230 
6.8333 + .1468 
mm. mm. 
140} 17.0150+ .0472| 10.0628+.0281 
3} 16.9500+.3350) 9.9666+.1468 
59.0214 .1135| 9.0200 + .0298 
58.5000 .5507| 8.7666+ .2407 
Dex., plain. ... 
banded. . 
Proportions. 
p. ct. 
76.7571 .1429 
77.5000 = .5507 
ture + length 
shell, propor- 
tions. 
p. ct. 
52.8500+ .1079 
51.5000 + .8412 
Dex., all.......| 143) 17.0136 .0469| 10.0608+.0277) 59.0105 .1114) 9.0147 .0297| 6.9308+ .0227 
76.7727 + .1406 
52.8217+.1077 
Tooth, index.! 
2.4930 + .0765 
1.6666 = .3668 
2.4759 + .0756 
3) 17.4500+ .1652| 10.5667 +.1600} 60.5000+.5507| 9.1000 .1682) 7.3667 + .1324 
Sin., plain, all. . 
STANDARD DEVIATION. 
80.8333 + .8002 
51.8333 + .4856 
1.9909 = .0802) 0.5225 + .0210) 0.4032 + .0163 
1.4142+ .3894| .6182+.1702) .3771+.1038 
\ .| 140) 0.8281+.0334| 0.4937+.0198 
3 -8602 + .2369 .3771+ .1038 
143 1.9759 .0788) .5259+.0210} .4029+.0161 
-4918+ .0196 
-8319 + .0332 
2.5082 + .1010 
1.4142 + .3894 
2.4924 + .0994 
1.8933 = .0763 
2.1602 + .5948 
| 1.9091+.0762 
2.0000 + .3179 
1.3517+.0541 
-9421 + .2592 
1.3497 + .0534 
Sin., plain, all. . 4242+ .1168} .4109+.1131| 1.4142+.3894| .4320+.1189| .3399+.0936 
1Numbers for the several groups are 142, 3, 145, 3. 
2.0548 + .5658 
1.2471 .3434 
-8165 + .2248 
